ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 0044-2313
    Keywords: Chromium, molybdenum complexes ; metal-substituted cyclotriphane ligand ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Metal-Substituted Cyclotriphosphane [(η5-C5Me5)(CO)2Fe—P]3 as Terminal η2-Ligand in Chromium and Molybdenum Tetracarbonyl ComplexesThe transition metal-substituted cyclotriphosphane [(η5-C5Me5)(CO)2Fe - P]3 reacts with (norbornadiene)M(CO)4 (M = Cr, Mo) to give monomeric complexes of the composition η2-[(η5-C5Me5)(CO)2Fe—P]3M(CO)4. The molecular structure of 2 is elucidated by X-ray analysis. The skeleton of the molecule consists of a P3 triangle with one trans and two cis-located Fe(CO)2(C5Me5) substituents. Both cis-configurated phosphorus atoms of the triangle are coordinated to a Cr(CO)4 fragment. The bond distance between the two cis orientated phosphorus atoms [2.191(5) and 2.183(6) Å] is slightly shorter with respect to the other P—P bonds [2.206(5), 2.217(5) and 2.214(5), 2.211(5) Å, respectively]. The cyclotriphosphane unit and the triangle defined by two phosphorus atoms and the metal atom enclose a dihedral angle of 44.8° and 43.4°, respectively. The Cr(CO)4 group is severely distorted by interactions with the cis-oriented (η5-C5Me5)(CO)2Fe substituent at P(3).
    Notes: Bei der Umsetzung des übergangsmetallsubstituierten Cyclotriphosphans [(η5-C5Me5)(CO)2Fe-P]3 (1) mit (Norbornadien)M(CO)4 (M = Cr, Mo) werden monomere Komplexe der Zusammensetzung η2-[(η2-C5Me5)Fe-P]3M(CO)4 (2: M = Cr; 3: M = Mo) erhalten. Die Struktur von 2 wurde durch Röntgenbeugungsanalyse bestimmt. Das Grundgerüst des Moleküls besteht aus einem Dreieck aus Phosphoratomen mit zwei cis- und einem trans-ständigen Fe(CO)2(C5Me5)-Substituenten. Die beiden cis-konfigurierten P-Atome des Dreiringes sind an ein Cr(CO)4-Fragment koordiniert. Dabei ist ihr Abstand [2, 191 (5) und 2,183(6) Å] gegenüber den beiden anderen P-P-Bindungen [2,206(5) und 2,217(5) bzw. 2,214(5) Å] geringfügig verkürzt. Die P3-Einheit und das P2Cr-Dreieck schließen einen Diederwinkel von 44,8° bzw. 43,4° ein. Aufgrund sterischer Wechselwirkungen mit dem cis-orientierten (η5-C5Me5)(CO)2FE-Substituenten an P(3) ist das Cr(CO)4-Fragment stark verzerrt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 0044-2313
    Keywords: Transition metal substituted phosphaalkenes ; isophosphaalkyne complex ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Substituted Acylphosphanes and Phosphaalkenes. 17. Synthesis and Structure of the μ-Isophosphaalkyne Complexes [(η5-C5H5)2(CO)2Fe2(μ-CO)(μ-C=PC6H2R3)] (R = Me, iPr, tBu).Condensation of (η5-C5H5)2(CO)2Fe2(μ-CO)(μ-CSMe)}+SO3CF3- (6) with 2,4,6-R3C6H2PH(SiMe3) (7) (a: R = Me, b: R = iPr, c: R = tBu) affords the complexes (η5-C5H5)2(CO)2Fe2(μ-CO)(η-C=PC6H2R3-2,4,6) (9 a-c) with edge-bridging isophosphaalkyne ligands as confirmed by the x-ray structure analysis of 9 a.
    Notes: Die Kondensation des μ-Carbinkomplexes {(η5-C5H5)2(CO)2Fe2(μ-CO)(μ-CSMe)}+SO3CF3- (6) mit den Phosphanen 2,4,6-R3C6H2PH(SiMe3) (7) (a: R = Me, b: R = iPr, c: R = tBu) liefert die Komplexe (η5-C5H5)2(CO)2Fe2(μ-CO)(η-C=PC6H2R3-2,4,6) 9a-c, die die neuartigen Isophosphaalkine C≡P-Aryl als Brückenliganden tragen. Von 9 a wurde eine Röntgenstrukturanalyse durchgeführt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 0044-2313
    Keywords: Transition metal substituted diphosphenes and phosphaalkenes ; hydration ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Substituted Diphosphenes. 32. Transition Metal Substituted Acyl Phosphanes and Phosphaalkenes. 16. Hydration of (η5-C5Me5)(CO)2Fe—P=P-Mes* (Mes* = 2,4,6-t-Bu3C6H2) and (η5-C5Me5)(CO)2Fe—P=C(SiMe3)2 with 1,1,1,3,3,3-Hexafluoropropane-2,2-diole Dihydrate. X-Ray Structure Analyses of (η5-C5Me5)(CO)2Fe—P(O)(H)(PHMes*) and (η5-C5Me5)(CO)2Fe—P(O)(H)[CH(SiMe3)2]The reaction of (η5-C5Me5)(CO)2Fe—P=C(SiMe3)2 (1) with an equimolar amount of 1,1,1,3,3,3 hexafluoropropane-2,2-diol-dihydrate (hexafluoroacetone-trihydrate) leads to the addition of water to the P=C bond under formation of the phosphinito complex (η5-C5Me5)(CO)2Fe—P(O)(H)[CH(SiMe3)2] (2). Similarly the diphosphenyl complex (η5-C5Me5)(CO)2Fe—P=P-Mes* (Mes* = 2,4,6-t-Bu3C6H2) (3) is converted into (η5-C5Me5)(CO)2Fe—P(O)(H)(PHMes*) 4. The NMR spectra of the latter show the presence of the two diastereoisomers 4a and 4b. Constitution and configuration of 2 · (CF3)2C(OH)2 and 4a · 2(CF3)2C(OH)2 in the crystal were elucidated by x-ray analysis.
    Notes: Bei der Reaktion von (η5-C5Me5)(CO)2Fe—P=C(SiMe3)2 (1) mit einer äquimolaren Menge an 1,1,1,3,3,3-Hexafluorpropan-2,2-diol-Dihydrat (Hexafluoraceton-Trihydrat) wird ein Wassermolekül an die P=C-Bindung unter Bildung des Phosphinito-Komplexes (η5-C5Me5)(CO)2FeP(O)(H)[CH(SiMe3)2] (2) angelagert. In ähnlicher Weise läßt sich der Diphosphenylkomplex (η5-C5Me5)(CO)2Fe—P=P-Mes* (Mes* = 2,4,6-t-Bu3C6H2) (3) in den Komplex (η5-C5Me5)(CO)2Fe—P(O)(H)(PHMes*) 4 überführen. Bei letzterem werden NMR-spektroskopisch die beiden Diastereoisomeren 4a und 4b unterschieden. Konstitution und Konfiguration von 2 · (CF3)2C(OH)2 und 4a · 2(CF3)2C(OH)2 wurden durch Einkristall-Röntgenstrukturanalysen ermittelt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 0044-2313
    Keywords: γ-anti effect ; 1-phosphabicyclo 3.3.1 nonane derivatives ; pentacarbonylchromium complex ; structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: γ-Anti Effect in 1-Phosphabicyclo[3.3.1]nonane Derivatives with Substituents at Phosphorus. Synthesis and Structure of Pentacarbonyl(1-phosphabicyclo[3.3.1]nonane) ChromiumIn 1-phosphabicyclo[3.3.1]nonane derivatives of the composition C8H15P(X) the CC-conformation always dominates. Changes in the chemical shifts of the bridge-head carbon atom C(5) in the 13C-NMR spectrum are only originated by the electronic influence of the substituent X at the phosphorus centre. Based on a homogeneous interpretation of the electronic interactions and with regard to Pearsons's definition of electronegativity the electronegativities of substituents at the phosphorus atom X = Cr(CO)5, Fe(CO)4, and Ni(CO)3 are estimated. These groups are placed in antiperiplanar orientation to the carbon atom C(5).The molecular structure of (1-phosphabicyclo[3.3.1]-nonane) Cr(CO)5 3 was elucidated by X-ray diffraction analysis. The molecule features the 1-phosphabicyclononane ligand in the CC-conformation, which has a nearly undistorted Cr(CO)5 unit coordinated to the phosphorus atom (d Cr—P = 2.368(1) Å).
    Notes: Bei 1-Phosphabicyclo[3.3.1]nonan-Derivaten C8H15P(X) dominiert stets die CC-Konformation. Änderungen der chemischen Verschiebung des C(5)-Brückenkopfatoms im 13C-NMR-Spektrum werden alleine durch den elektronischen Einfluß des Substituenten X am Phosphoratom hervorgerufen. Auf der Grundlage einer einheitlichen Interpretation der elektronischen Wechselwirkungen und unter Anwendung des Elektronegativitätsbegriffs von Pearson konnte die Elektronegativität der in antiperiplanarer Position zu C(5) stehenden Phosphorsubstituenten X = Cr(CO)5, Fe(CO)4, Ni(CO)3 abgeschätzt werden.Die Molekülstruktur von (1-Phosphabicyclo[3.3.1]-nonan) Cr(CO)5 (3) wurde mittels Röntgenbeugung ermittelt. Das Molekül zeigt das Bild eines 1-Phosphabicyclo[3.3.1]nonans in der CC-Konformation, an dessen Phosphoratom eine nahezu unverzerrte Cr(CO)5 Einheit (d Cr—P = 2,368(1) Å) koordiniert ist.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 0044-2313
    Keywords: Metallophosphaalkenes ; hexafluoracetone ; metallodisilyl phosphanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal-substituted Acylphosphanes and Phosphaalkenes. 22. Insertions of Hexafluoroacetone into the PX-Bond of Metallophosphanes (η5-C5Me5)(CO)2M—PX2 (M = Fe, Ru; X = Me3Si, Cl). Structure Determination of (η5-C5Me5)(CO)2Fe—P(SiMe3)C(CF3)2(OSiMe3)Reaction of the metallophosphanes (η5-C5Me5)(CO)2M—P(SiMe3)2 (1a: M = Fe; 1b: M = Ru) with hexafluoroacetone (HFA) afforded the complexes (η5-C5Me5)(CO)2M—P(SiMe3)C(CF3)2(OSiMe3) (2a, b). The attempted synthesis of a metallophosphaalkene from 2a by thermal elimination of hexamethyldisiloxane failed. The acid catalyzed hydrolysis of 2a afforded compound (η5-C5Me5) · (CO)2Fe—P(H)C(CF3)2(OSiMe3) (3).Hexafluoracetone and (η5-C5Me5)(CO)2Fe—PCl2 (4) under-went reaction to give the metallochlorophosphan (η5-C5Me5) · (CO)2Fe—P(Cl)—O—C(CF3)2Cl (5). Constitutions and configurations of the compounds (2-5) were established by elemental analyses and spectroscopic data (IR, 1H-, 13C, 19F-, 29Si-, 31P-NMR, MS). The molecular structure of 2a was determined by x-ray diffraction analysis.
    Notes: Die Reaktion der Metallophosphane (η5-C5Me5)(CO)2M—P(SiMe3)2 (1a: M = Fe; 1b: M = Ru) mit Hexafluoraceton (HFA) liefert die Komplexe (η5-C5Me5) · (CO)2M—P(SiMe3)C(CF3)2(OSiMe3) (2a, b) Eliminierungsversuche von Hexamethyldisiloxan unter Ausbildung eines Metallophosphaalkens scheiterten. Bei der säurekatalysierten Hydrolyse von 2a entsteht die Verbindung (η5-C5Me5)(CO)2Fe—P(H)C(CF3)2(OSiMe3) (3). Hexafluoraceton und (η5-C5Me5)(CO)2Fe—PCl2 (4) reagieren zum Metallophosphan (η5-C5Me5)(CO)2Fe—P(Cl)—O—C(CF3)2Cl (5). Konstitution und Konfiguration der Verbindungen (2-5) wurden durch Elementaranalysen und spektroskopische Daten (IR, 1H-, 13C, 19F-, 29Si-, 31P-NMR sowie MS) ermittelt. Von 2a wurde zudem eine Einkristall-Röntgenstrukturanalyse durchgeführt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 0044-2313
    Keywords: Metallodiphosphenes ; alkyl isocyanides ; 1,3-diphosphapropene ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal-substituted Diphosphenes. 37. Cleavage of the P=P Bond in the Metallodiphosphene (η5-C5Me5)(CO)2Fe—P=P—Mes* (Mes* = 2,4,6-tBu3C6H2) by Alkyl Isocyanides. Structure of (μ5-C5Me5)(CO)2Fe—P(NH—CH2C6H5)—C(NH—CH2C6H5)=PMes*The reaction of the metallodiphosphene (η5-C5Me5) · (CO)2Fe—P=P—Mes* (1) with two equivalents of cyclohexylisocyanide (3 a) or benzylisocyanide, respectively, afforded (E/Z)-mixtures of the 2,4-diimino-1,3-diphosphetanes (η5-C5Me5)(CO)2Fe—=NR (3 a: R = c-C6H11; 3 b: R = CH2C6H5). Complex 1 reacted with one equivalent of benzylisocyanide in an excess of benzylamine to give the 3-metallo-1,3-diphosphapropene (η5-C5Me5)(CO)2Fe—P·(NH—CH2C6H5)—C(NH—CH2C6H5)=PMes* (4). Constitution and configuration of the compounds 3 a, b, 4 were established by elemental analysis and spectra (IR, 1H-, 13C-, 31P-NMR, MS). The molecular structure of 4 was determined by x-ray diffraction analysis.
    Notes: Die Reaktion des Metallodiphosphens (η5-C5Me5)(CO)2Fe—P=P—Mes* (1) mit zwei Äquivalenten Cyclohexylisocyanid (2 a) bzw. Benzylisocyanid (2 b) liefert (E/Z)-Gemische der 2,4-Diimino-1,3-diphosphetane (η5-C5Me5)(CO)2Fe—=NR (3 a: R = c-C6H11; 3 b: R = CH2C5H5). Komplex 1 reagiert mit einem Äquivalent Benzylisocyanid in Benzylamin als Lösungsmittel zu dem 3-Metallo-1,3-diphosphapropen (η5-C5Me5)(CO)2Fe—P · (NHCH2C6H5)—C(NHCH2C6H5)=PMes* (4). Konstitution und Konfiguration der Verbindungen 3 a, b, 4 wurden durch Elementaranalysen und Spektren (IR, 1H, 13C, 31P-NMR, MS) ermittelt. Von 4 wurde zusätzlich eine Einkristall-Röntgenstrukturanalyse durchgeführt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 0044-2313
    Keywords: 1,2-Diphosphaferrocenes ; Transition Metal Complexes ; X-Ray Structure Analysis ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,2-Diphosphaferrocenes as Ligands in Transition Metal Complexes. X-Ray Structure Analysis of [(η5-1,3-tBu2C5H3){η5-1,2-[Co2(CO)6]-3,4-(Me3SiO)2-5-(Me3Si)P2C3}]Reaction of metallo-1,2-diphosphapropene (η5-tBuC5H4)(CO)2Fe—P(SiMe3)—P=C(SiMe3)2 with (Z-cyclooctene)Cr(CO)5 afforded the pentacarbonylchromium adduct of a 1,2-diphosphaferrocene [(η5-tBuC5C5H4){η5-1-[Cr(CO)5]-3,4-(Me3SiO)2-5-(Me3Si)P2C3}Fe] (1 c). Diphosphaferrocene [(η5-tBuC5H4){η5-3,4-(Me3SiO)2-5-(Me3Si)P2C3}Fe] (2 c) was formed when (η5-tBuC5H4)(CO)2FeBr was treated with (Me3Si)2P—P=C(SiMe3)2 in toluene at 60°C. Photolysis of molybdenum- and tungsten hexacarbonyl in the presence of [(η5-1,3-tBu2C5H3){η5-3,4-(Me3SiO)2-5-(Me3Si)P2C3}Fe] (2 b) gave the pentacarbonylmetal adducts 8 (M = Mo) and 9 (M = W), respectively. A corresponding manganese derivative resulted from the photochemical reaction of 2 b and (MeC5H4)Mn(CO)3. Treatment of 2 b with Co2(CO)8 yielded trinuclear [(η5-1,3-tBu2C5H3){η5-1,2-[Co2(CO)6]-3,4-(Me3SiO)2-5-(Me3Si)P2C3}Fe] (11). Constitution and configuration of compounds 1 c, 2 c, 8 - 11 were determined by elemental analyses and spectra (IR, 1H-, 13C-, 31P-NMR, MS). In addition the molecular structure of 11 was established by single crystal X-ray analysis.
    Notes: Die Reaktion des Metallo-1,2-diphosphapropens (η5-tBuC5H4)(CO)2Fe—P(SiMe3)—P=C(SiMe3)2 mit (Cycloocten)Cr(CO)5 liefert das Pentacarbonylchrom-Addukt eines 1,2-Diphosphaferrocenes [(η5-tBuC5H4){η5-1-[Cr(CO)5]-3,4-(Me3SiO)2-5-(Me3Si)P2C3}Fe] (1c). Das Carbonyl-metall-freie 1,2-Diphosphaferrocen [(η5-tBuC5H4){η5-3,4-(Me3SiO)2-5-(Me3Si)P2C3}Fe] (2 c) entsteht bei der Umsetzung von (η5-tBuC5H4)(CO)2FeBr mit (Me3Si)2P—P = C(SiMe3)2 in Toluol bei 60°C. Das 1,2-Diphosphaferrocen [(η5-1,3-tBu2C5H3){η5-3,4-(Me3SiO)2-5-(Me3Si)P2C3}Fe] (2 b) reagiert mit den Hexacarbonylen von Molybdän und Wolfram bei Bestrahlung zu den Pentacarbonylmetall-Addukten 8 (M = Mo) und 9 (M = W). Ein entsprechender Mangankomplex 10 wird bei der photochemischen Reaktion von 2 b mit (MeC5H4)Mn(CO)3 gebildet. Im Gegensatz hierzu entsteht bei der Behandlung von 2 b mit Co2(CO)8 der dreikernige Komplex [(η5-1,3-tBu2C5H3){η5-1,2-[Co2(CO)6]-3,4-(Me3SiO)2-5-(Me3Si)P2C3} Fe] (11). Konstitution und Konfiguration der Verbindungen 1 c, 2 c, und 8 - 11 wurden durch Elementaranalysen und Spektren (IR, 1H-, 13C-, 31P-NMR, MS) ermittelt. Von 11 wurde zusätzlich eine Einkristall-Röntgenstrukturanalyse durchgeführt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 0022-328X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 0022-328X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 0022-328X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...